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G-C3N4/TiO2/C nano heterojunction photocatalyst and in-situ preparation method thereof

A photocatalyst and in-situ preparation technology, which is applied in the field of photocatalytic degradation of pollutants, can solve the problems of low photoelectric conversion efficiency of the catalyst, visible light and near-infrared light absorption response, etc., and achieve stable thermodynamic performance, simple and effective preparation method load effect

Active Publication Date: 2022-06-03
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, because nano-TiO2 has a wide intrinsic band gap (3.2eV~3.7eV), the wavelength range of its photoelectric conversion response only exists in less than 3% of the entire solar radiation wavelength- 5% of the ultraviolet light band cannot absorb the visible light and near-infrared light as the main body of solar radiation energy, so the solar photoelectric conversion efficiency of pure TiO2 catalyst is relatively low

Method used

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  • G-C3N4/TiO2/C nano heterojunction photocatalyst and in-situ preparation method thereof
  • G-C3N4/TiO2/C nano heterojunction photocatalyst and in-situ preparation method thereof
  • G-C3N4/TiO2/C nano heterojunction photocatalyst and in-situ preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 10 mL of tetramethylammonium hydroxide to 30 mL of ethylene glycol, then add 5 g of dicyandiamide, slowly drop in 2 mL of isopropyl titanate while stirring, and stir to a clear liquid; place the above-mentioned liquid in a hydrothermal kettle, After hydrothermal treatment at 200 °C for 8 h, the nano-titania intermediate with adsorbed nitrogen source was obtained. The obtained intermediate was heated to 300 °C at a rate of 5 °C / min in a muffle furnace under an air atmosphere, and then calcined at 300 °C for 2 h to obtain g-C 3 N 4 / TiO 2 / C nanoheterojunction photocatalyst.

[0029] 10mg of the above photocatalyst was dispersed by ultrasonic to dissolve it in 50ml of tetracycline hydrochloride (20mg / L) solution, react in dark for 30min, and then illuminated under 300w xenon lamp (no filter) and 300w xenon lamp (filter>400nm) , every 5 / 10 / 20min sampling test.

[0030] like figure 2 As shown, the photocatalyst obtained in Example 1 has a degradation efficiency of...

Embodiment 2

[0034] Add 10 mL of tetramethylammonium hydroxide to 30 mL of ethylene glycol, then add 5 g of dicyandiamide, slowly drop in 2 mL of isopropyl titanate while stirring, and stir to a clear liquid; place the above-mentioned liquid in a hydrothermal kettle, After hydrothermal treatment at 200 °C for 8 h, the nano-titania intermediate with adsorbed nitrogen source was obtained. The obtained intermediate was heated to 500 °C at a rate of 5 °C / min in a muffle furnace under an air atmosphere, and then calcined at 500 °C for 2 h to obtain g-C 3 N 4 / TiO 2 / C nanoheterojunction photocatalyst.

[0035] 10mg of the above photocatalyst was dispersed by ultrasonic to dissolve it in 50ml of tetracycline hydrochloride (20mg / L) solution, react in dark for 30min, and then illuminated under 300w xenon lamp (no filter) and 300w xenon lamp (filter>400nm) , every 5 / 10 / 20min sampling test.

[0036] like figure 2 As shown, the photocatalyst obtained in Example 2 had a degradation efficiency of...

Embodiment 3

[0038] Add 10mL of tetramethylammonium hydroxide to 30mL of ethylene glycol, then add 2.5g of urea, slowly drop in 2mL of isopropyl titanate while stirring, and stir to a clear liquid; place the above-mentioned liquid in a hydrothermal still After hydrothermal treatment at 200℃ for 8h, the nano-titania intermediate with adsorbed nitrogen source was obtained. The obtained intermediate was heated to 300 °C at a rate of 5 °C / min in a muffle furnace under an air atmosphere, and then calcined at 300 °C for 2 h to obtain g-C 3 N 4 / TiO 2 / C nanoheterojunction photocatalyst.

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Abstract

The invention discloses a g-C3N4 / TiO2 / C nano heterojunction photocatalyst and an in-situ preparation method thereof.The preparation method comprises the steps that in the nitrogen source environment, tetramethylammonium hydroxide is used as a surfactant of nano titanium dioxide, and a titanium dioxide intermediate adsorbing a nitrogen source is obtained through a wet chemical hydrothermal reaction; then, the titanium dioxide intermediate is subjected to heat treatment, and the g-C3N4 / TiO2 / C nano heterojunction photocatalyst is obtained. According to the method, in-situ synthesis of the g-C3N4 / TiO2 / C nano heterojunction is achieved, the method is easy to operate, the raw materials are easy to obtain, the cost is low, the method is environmentally friendly, the prepared g-C3N4 / TiO2 / C nano heterojunction achieves nano-level compounding, interface bonding is tight, a double Z-type energy band structure is formed, separation and transmission of photon-generated carriers are facilitated, and the photoelectric conversion efficiency is improved. The photocatalyst has excellent performance and positive significance in the aspect of photocatalytic degradation of organic pollutants, and has a good application prospect.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic degradation of pollutants, and in particular relates to a g-C 3 N 4 / TiO 2 / C nanoheterojunction photocatalyst and its in-situ preparation method. Background technique [0002] Semiconductor photocatalysis is a technology that can effectively utilize solar energy for photoelectric conversion to treat environmental organic pollutants. It plays an important role as a bridge between modern industrial development and environmental protection. Among them, nano-TiO 2 It is the first material to be discovered and applied in the field of photocatalysis. Nano TiO 2 It has good chemical stability, thermal stability, hydrophilicity, high surface activity and good light absorption performance. But because of nano-TiO 2 It has a wide intrinsic forbidden band width (3.2eV~3.7eV), and the wavelength range of its photoelectric conversion response only exists in the ultraviolet light band, which accou...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/06B01J37/10B01J37/08C02F1/30B82Y30/00B82Y40/00C02F101/30C02F101/34C02F101/38
CPCB01J27/24B01J21/063B01J37/10B01J37/086C02F1/30B82Y30/00B82Y40/00C02F2101/30C02F2305/10C02F2101/34C02F2101/345C02F2101/38B01J35/39Y02W10/37
Inventor 王智宇刘哲
Owner ZHEJIANG UNIV